SOLAR SYSTEM                         
These questions deal with the SOLAR SYSTEM in which we live.
Q
How many planets are in our solar system?
A
Nine
Q
What is the definition of a light-year?
A
The distance that light travels in a vacuum for a period of 
one year, approximately 5.878 trillion miles.
Q
How is the distance in miles between the moon and the earth?
A
252,950 miles at its apogee to 221,600 at its perigee